Home / 12,786.39-19,182.20-5,390.85

Finding the Fourth Proportional to 12,786.39, 19,182.20 and 5,390.85

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Solution

The fourth proportional to 12,786.39, 19,182.20 and 5,390.85 is: 8,087.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,786.39 : 19,182.20 = 5,390.85 : x
  2. Step 2: Convert to fraction form
    12,786.39/19,182.20 = 5,390.85/x
  3. Step 3: Cross multiply
    12,786.39x = 19,182.20 × 5,390.85
  4. Step 4: Simplify right side
    12,786.39x = 103,408,362.87
  5. Step 5: Solve for x
    x = 103,408,362.87/12,786.39
  6. Step 6: Final answer
    x = 8,087.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.